Pokémon

https://kdata1.com/2016/04/Pokemon-ultra-violet-guide.pdf

Odds for shiny in normal gen 3 are very low

In ultra Violet, the odds themselves are not higher, but if you walk through a 'shinyizers' spot as displayed on this guide here (i think there are 18 in total in the entire game) the next pokemon you interact with, be it wild, static, or trainer's, will be shiny so if you unknowingly run through a spot (some are in the grass and some arent) you may think that the encounter rate is just higher, when really there's just a way to make sure you get one. Hope this helps anyone in the future.

I've must have played like 500hs of Fire Red, Leaf Green, Ruby, etc. I only found 1 shiny, lol.

Shinies from gen6 onwards have odds halved from 1:8192 → 1:4096

However this dœsn't mean shinies suddenly trivial to find . Haven't recalled moments where found shinies unless actively lꚙKing for them till gen 9 where random encounters replaced with overworld

Also possible the ROM hack your playing might've increased odds but they've not advertised it